The students will not go to the Pierre-Joël-Bonté-de-Riom high school on Tuesday.
Following "insults and death threats" against teachers, the establishment closed Monday will again keep the door closed.
Investigations are underway to determine those responsible for the facts.
The Pierre-Joël-Bonté-de-Riom high school will remain closed on Tuesday.
The establishment of Puy-de-Dôme was closed Monday because of "insults and death threats" targeting teachers and the rectorate announced that this decision was maintained.
A high school student is in custody for the facts according to corroborating sources.
An investigation entrusted to the Clermont-Ferrand police station was opened for "death threats under conditions", told AFP the public prosecutor Eric Maillaud.
Distance courses organized
"We have decided to close the school on Monday following insults and death threats, to protect the students and staff, but we welcome high school students who have not received the information and staff who wish to come ", said for her part a spokesperson for the rectorate, confirming information from the daily
La Montagne
.
If the establishment will not reopen its doors on Tuesday, distance courses will be provided, the rectorate said Monday evening.
A psychological unit has been set up in the establishment, which has around 1,000 students.
A 15-year-old high school student is in police custody Monday morning.
The maintenance or not of the latter was not communicated in the evening by the prosecution.
Another student had been taken into custody this weekend but it was lifted, according to the prosecutor.
The first messages sent via the ENT last week to teachers and education counselors were "pornographic" and then turned this weekend into "threats of violence, rape and death", he said. He specifies.
A last message included an image related to jihadism "as we find everywhere", he added.